Customer states, the gauges on the left randomly stop working and then all of a sudden start to work. Start by removing the 4 small screws and pull the dash forward towards the steering wheel and look at the rear jumper cables that connect from one gauge to another.

Over time the jumper wires will get loose and make a false contact, so instead of replacing the jumper cables try providing tension and see this helps. Any broken gauges or loose gauges can cause similar problems.